Would you mind explaining the reason? His Wikipedia page [0] doesn't mention anything, although it does mention the story with four citations. One explicitly states "Though they didn’t really control us, they did monitor our movement across their scope." [1]

Off topic, but be sure to run Javascript on theaviationgeekclub.com or else the code that breaks your clipboard will fail to run.

[0] https://en.wikipedia.org/wiki/Brian_Shul

[1] https://theaviationgeekclub.com/sr-71-blackbird-pilot-tells-...